Generally, it is possible to change the freehub body to different standards on DT Swiss hubs. However, their website only shows examples of swapping between various road-specific standards, or various MTB-specific standards.
Is it possible to swap from a road standard to an MTB standard?
To make this question more concrete, is it possible to change a GR 1600 Spline rear wheel, which comes with a 350 hub, to use a Shimano Micro Spline freehub body?